Higher-Order Uniformly Convergent Numerical Scheme for Singularly Perturbed Differential Difference Equations with Mixed Small Shifts

Table 8

Maximum absolute error of Example 4 after Richardson extrapolation for .

	8	16	32	64	128	256
	4.5788e − 03	1.1469e − 03	2.8666e − 04	7.1658e − 05	1.7914e − 05	4.4784e − 06
	1.6150e − 02	2.4525e − 03	4.8456e − 04	1.1290e − 04	2.7710e − 05	6.5434e − 06
	2.4943e − 02	6.9160e − 03	1.2055e − 03	1.6886e − 04	3.2527e − 05	8.9632e − 06
	2.4996e − 02	7.0011e − 03	1.8068e − 03	4.5088e − 04	7.6356e − 05	1.2456e − 05
	2.4999e − 02	7.0020e − 03	1.8071e − 03	4.5547e − 04	1.1410e − 04	2.8541e − 05
	2.4999e − 02	7.0021e − 03	1.8071e − 03	4.5548e − 04	1.1410e − 04	2.8541e − 05
	2.4999e − 02	7.0021e − 03	1.8071e − 03	4.5548e − 04	1.1410e − 04	2.8541e − 05
	2.4999e − 02	7.0021e − 03	1.8071e − 03	4.5548e − 04	1.1410e − 04	2.8541e − 05
	2.4999e − 02	7.0021e − 03	1.8071e − 03	4.5548e − 04	1.1410e − 04	2.8541e − 05
	2.4999e − 02	7.0021e − 03	1.8071e − 03	4.5548e − 04	1.1410e − 04	2.8541e − 05
	2.4999e − 02	7.0021e − 03	1.8071e − 03	4.5548e − 04	1.1410e − 04	2.8541e − 05
	2.4999e − 02	7.0021e − 03	1.8071e − 03	4.5548e − 04	1.1410e − 04	2.8541e − 05
	1.8360	1.9541	1.9882	1.9971	1.9992	–